Để a459b chia cho 2 và 5 dư 1 thì b = 1
Để a4591 chia cho 9 dư 1 thì a = 9
Vậy x = 94591
Để a459b chia 2 và 5 dư 1 thì b = 1
Mà để a459b chia 9 dư 1 thì: (a + 4 + 5 + 9 + 1) chia 9 dư 1
=> a = 0;9
VÌ a459b chia cho 2;5;9 dư 1
=> b=1
Để a4591 :9 dư 1 thì a= 9
Vậy Sô trên là:94591
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